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The disadvantage of the platinum rhodium thermocouple is that the thermoelectric potential is small and the sensitivity is low.
2012-3-6 10:02:40


,质量可靠,检测有保障,铂铑是一种传统的测温元件,具有热电性能稳定、抗氧化性强,长期使用温度为1600℃,短期使用温度为1800℃。 LY-WRP platinum rhodium thermocouple is reliable in quality and guaranteed in testing. Platinum rhodium is a traditional temperature measuring element with stable thermoelectric performance and strong oxidation resistance. The long-term use temperature is 1600 ℃ and the short-term use temperature is 1800 ℃. Taizhou Platinum Rhodium Coupler "Using 99 Corundum Protective Cover" and "High Purity Platinum Rhodium Alloy Wire" have high temperature resistance, accurate temperature measurement and high accuracy. Platinum-rhodium thermocouple is a traditional temperature measuring element. It has stable thermoelectric properties and strong oxidation resistance, and is suitable for continuous use in an oxidizing and inert atmosphere. The long-term use temperature is 1600 ° C and the short-term use temperature is 1800 ° C. The technical indicators of the paper recorder are as follows: 1. Temperature measurement range: 0 ~ 1800 ℃ 2. Temperature measurement accuracy: <± 0.5% t 3. Time constant: ≤180s 4. Insulation resistance: 5MΩ (at 20 ℃) 5. Specifications: 500, 750, 1000, 1200 (mm)

又称高温贵金属热电偶,铂铑有单铂铑(铂铑10-铂铑)和双铂铑(铂铑30-铂铑6) 铂铑热电偶之分,它们作为温度测量传感器,通常与温度变送器、调节器及显示仪表等配套使用,组成过程控制系统,用以直接测量或控制各种生产过程中0-1800℃范围内的流体、蒸汽和气体介质以及固体表面等温度。 Platinum and rhodium thermocouples are also called high temperature precious metal thermocouples. Platinum and rhodium are divided into single platinum rhodium (platinum rhodium 10-platinum rhodium) and double platinum rhodium (platinum rhodium 30-platinum rhodium 6). They are used as temperature measurement sensors. It is usually used in conjunction with temperature transmitters, regulators and display instruments to form a process control system to directly measure or control fluids, vapors and gaseous media and solid surfaces in the range of 0-1800 ° C in various production processes. temperature. Platinum and rhodium thermocouples are precious metal thermocouples. The diameter of the wire is specified as 0.5mm, and the allowable deviation is -0.015mm. The nominal chemical composition of the positive electrode (BP) is a platinum-rhodium alloy, which contains 30% rhodium, 70% platinum, and the negative electrode (BN) is a platinum-rhodium alloy. The amount of rhodium is 6%, so it is commonly called double platinum rhodium thermocouple. The long-term maximum use temperature of this thermocouple is 1600 ℃, and the short-term maximum use temperature is 1800 ℃.

在热电偶系列中具有准确度最高,稳定性最好,测温温区宽,使用寿命长,测温上限高等优点。 Platinum and rhodium thermocouples have the highest accuracy, the best stability in the thermocouple series, a wide temperature range, a long service life, and a high temperature limit. It is suitable for oxidizing and inert atmosphere, and can also be used in vacuum for a short time, but it is not suitable for reducing atmosphere or metal or non-metal vapor atmosphere. An obvious advantage of the B-type thermocouple is that it does not need to be compensated with a compensation wire, because the thermoelectric potential is less than 3μV in the range of 0 ~ 50 ° C. Disadvantages: The shortcomings of platinum and rhodium thermocouples are thermoelectric potential, small thermoelectric potential, low sensitivity reading, low mechanical strength at high temperature, very sensitive to pollution, expensive precious metal materials, and therefore a large one-time investment. The working principle of platinum rhodium thermocouple is that when two ends of a conductor with two different compositions are connected to a circuit, when the temperature of the two junctions is different, a thermal current will be generated in the circuit. If there is a temperature difference between the working end and the reference end of the thermocouple, the display meter will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple. Selection of platinum-rhodium thermocouple: It is recommended to use a single platinum-rhodium thermocouple (platinum-rhodium 10-platinum) when the measured temperature is normally 1000 ~ 1300 ℃, and it is recommended to use a double-platinum rhodium thermocouple (1 Platinum rhodium 30-platinum rhodium 6), so that the service life of the platinum rhodium thermocouple can be guaranteed in the temperature range used.